Efectiveness of Chaotic Modulation to the EM I Suppresion of Off-Line Switching Converters

Journal of South China University of Technology (Natural Science Edition) ›› 2005, Vol. 33 ›› Issue (5): 59-63,73.

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Efectiveness of Chaotic Modulation to the EM I Suppresion of Off-Line Switching Converters

Li Zhi-zhong Qiu Shui-sheng

Colege of Electronic and Information Engineering,South China Univ.of Tech.,Guangzhou 510640,Guangdong,China

Received:2004-05-26 Online:2005-05-25 Published:2005-05-25
Contact: 李志忠(1974-)，博士生，主要从事非线性电路与高频开关电源方面的研究 E-mail:lpzz@tom.com
About author:李志忠(1974-)，博士生，主要从事非线性电路与高频开关电源方面的研究
Supported by:
国家自然科学基金资助项目(60372004)；广东省自然科学基金资助项目(20820)

Abstract

Abstract:

CFMS(Chaotic Frequency Modulation Scheme)was realized by incorporating a Chua’S circuit into the pulsewidth modulator,which makes the switching frequency randomly vary with the chaotic signal.Th e efectiveness of CFMS to the EMI(Electromagnetic Interference)suppression of switching converters was then investigated.Moreover,the principle of the suppression of EMI noise by CFMS was analyzed and a simulation mod el for component-level circuits Was constructed.Simulated results show that,by means of CFMS,the peak value of the switching harmonics efectively decreases and the output voltage is slighfly influenced,indicating that CFMS is applicable to switching converters.

Key words: chaotic frequency modulation, electromagnetic interference, converter

Li Zhi-zhong Qiu Shui-sheng. Efectiveness of Chaotic Modulation to the EM I Suppresion of Off-Line Switching Converters[J]. Journal of South China University of Technology (Natural Science Edition), 2005, 33(5): 59-63,73.

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Efectiveness of Chaotic Modulation to the EM I Suppresion of Off-Line Switching Converters

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